It's the most famous military installation in the world, yet it doesn't officially exist. Area 51-- a site for covert Cold War operations-- has long been a magnet for crackpots, conspiracy theorists, and the overly curious. While there may not be truth to the rumours that Area 51 is a haven for UFO's and extraterrestrials, it's clear that the US government has been up to something in Area 51 for decades, and it turns out there is a kernel of truth to even some of the wildest speculation.